Raypak 503 manual On-BoardDiagnostic Center, Diagnostic Information, Category I* Boilers Type H

On-Board Diagnostic Center

Raypak’s MVB comes equipped with a microprocessor-controlled diagnostic control center that displays its information on a 2x20 character LCD display in plain English. This control monitors system safeties, ignition faults and system status, while storing up to 16 reported faults. Raypaks diagnostic center monitors the fault outputs of the Fenwal ignition control. Converting the Fenwal’s flashing lights into real English fault codes that anyone can understand. The control is also equipped with a SPDT dry contact relay output that is switched anytime a safety fault occurs.

This can be used for a heater alarm or a BMS safety interface.

Diagnostic Information

Safety Faults	Ignition Control Faults
• Condensate Drain	• Low Air
• Manual High Limit	• Flame- No CFH
• Auto High Limit	• Ignition Lockout
• Low Water Cut-off	• Low HSI Current
• Vent Pressure	• Low 24VAC
• High Gas Pressure	• Internal Control Fault
• Low Gas Pressure
• Controller Alarm
• Flow Switch
• Blower Switch
• Factory Option
• External Interlock
• Cold Water Run

CATEGORY I* BOILERS (TYPE H)

CATEGORY I* WATER HEATERS (TYPE WH)

CATEGORY IV BOILERS & WATER HEATERS (TYPE H & WH)

MVB			Flow Rates						Pressure Drops
	Minimum Flow			Maximum Flow				20°F		30°F		40°F
Model
	GPM	￿P FT	￿T °F	GPM	￿P FT	￿T °F	GPM	￿P FT	GPM	￿P FT	GPM	￿P FT
504	25	1.1	34	100	11.3	8	42	2.7	28	1.4	N/A	N/A
754	32	1.7	40	100	13.8	13	63	6.0	42	2.9	32	1.7
1104	46	4.1	40	113	18.6	16	92	13.3	62	6.7	46	4.1
1504	63	8.0	40	113	22.2	22	N/A	N/A	84	13.3	63	8.0
2004	84	16.0	40	113	27.2	30	N/A	N/A	112	26.9	84	16.0
MVB			Flow Rates					Pressure Drops
	Minimum Flow			Maximum Flow				20°F		30°F
Model
	GPM	￿P FT	￿T °F	GPM	￿P FT	￿T °F	GPM	￿P FT	GPM	￿P FT
504	50	2.8	17	100	11.3	8	N/A	N/A	28	1.4
754	50	3.5	25	100	13.8	13	64	6.1	42	3.0
1104	60	6.3	30	113	18.6	16	90	12.6	60	6.3
1504	82	12.6	30	113	22.2	22	N/A	N/A	82	12.6
2004	109	25.5	30	113	27.2	29	N/A	N/A	109	25.5
MVB			Flow Rates						Pressure Drops
	Minimum Flow			Maximum Flow			20°F		30°F		40°F
Model
	GPM	￿P FT	￿T °F	GPM	￿P FT	￿T °F	GPM	￿P FT	GPM	￿P FT	GPM	￿P FT
503	25†	1.1	35	100	11.3	9	43	2.8	29	1.4	N/A	N/A
753	33†	1.9	40	100	13.8	13	65	6.4	43	3.1	33	1.9
1003	43‡	3.7	40	113	18.6	15	87	12.0	58	6.0	43	3.7
1253	54‡	6.2	40	113	22.2	19	109	20.9	73	10.2	54	6.2
1503	65‡	9.5	40	113	25.5	23	N/A	N/A	87	16.0	65	9.5
1753	76‡	13.4	40	113	27.2	27	N/A	N/A	101	22.5	76	13.4
2003	87‡	15.2	40	116	30.2	30	N/A	N/A	116	31.9	87	18.9

Boiler Only

*Category I with vertical vent, category III with horizontal venting and no extractor.

† Minimum flow 50GPM for WH hot water supply.

6 ‡ Use 30° column as minimum flow for hot water supply.